如何爲CALayer設置平鋪背景圖像？

Question

當我爲IKBrowserView設置背景時，根據視圖大小調整背景大小：是否有將它設置爲平鋪圖像的方法，重複但未調整大小？

NSImage* backgroundImage = [NSImage imageNamed:@"wood-bg2.jpg"]; 
CALayer* aLayer = [CALayer layer]; 
//aLayer.contents = backgroundImage; 

CIColor *ci = [[CIColor alloc] initWithColor:[NSColor colorWithPatternImage:backgroundImage]]; 
CGColorSpaceRef cs = [ci colorSpace]; 
const CGFloat *comps = [ci components]; 
CGColorRef cgColor = CGColorCreate(cs, comps); 

aLayer.backgroundColor = cgColor; 
[itemThumbnailImageBrowserView setBackgroundLayer:aLayer]; 

我試過了註釋掉的代碼和當前的代碼，但都沒有工作。 感謝

Answer 1

還有的NSColor方法：

+ (NSColor *)colorWithPatternImage:(NSImage *)image 

所以，你可以做這樣的事情：

NSImage* backgroundImage = [NSImage imageNamed:@"wood-bg2.jpg"]; 
CALayer* aLayer = [CALayer layer]; 
aLayer.backgroundColor = [[NSColor colorWithPatternImage:backgroundImage] CGColor]; // - (CGColor) CGColor; is only available in OS X 10.8 and later 
[itemThumbnailImageBrowserView setBackgroundLayer:aLayer]; 

---

更新OS X 10.8和更低

轉換NSColor至CGColor（未測試）：

CIColor *ci = [[CIColor alloc] initWithColor:[NSColor colorWithPatternImage:backgroundImage]]; 
CGColorSpaceRef cs = [ci colorSpace]; 
const CGFloat *comps = [ci components]; 
CGColorRef cgColor = CGColorCreate(cs, comps);